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Which algorithm should you use for a low-power device that must employ digital signatures?

Which algorithm should you use for a low-power device that must employ digital signatures?

PrepAway - Latest Free Exam Questions & Answers

A.
AES

B.
RSA

C.
ECC

D.
ElGamal

Explanation:
Answer C is correct; digital signatures require asymmetric encryption. ECC is the strongest asymmetric algorithm per bit of key length. This allows shorter key lengths which require less CPU resources.

Incorrect Answers and Explanations: A, B, and D: Answers A, B, and D are incorrect. AES is a symmetric cipher; symmetric ciphers are not used in digital signatures. RSA is based on factoring composite numbers into their primes, and ElGamal is based on discrete logarithms. Both methods provide roughly the same strength per bit and are far weaker per bit than ECC.

2 Comments on “Which algorithm should you use for a low-power device that must employ digital signatures?

  1. Joe says:

    ECC is the strongest asymmetric algorithm per bit of key length. This allows shorter key lengths which require less CPU resources.

    AES is a symmetric cipher; symmetric ciphers are not used in digital signatures.

    RSA is based on factoring composite numbers into their primes, and

    ElGamal is based on discrete logarithms. Both methods provide roughly the same strength per bit and are far weaker per bit than ECC.




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